GeForce GTX Titan X vs Radeon R5 M255

Intro

Compare all of that to the Radeon R5 M255, which has a core clock speed of 940 MHz and a DDR3 memory speed of 1000 MHz. It also features a 64-bit memory bus, and uses a 28 nm design. It features 320 SPUs, 20 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX Titan X should perform a lot faster than the Radeon R5 M255 overall. (explain)

GeForce GTX Titan X		336000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 320000 (2000%)

Texel Rate

The GeForce GTX Titan X should be quite a bit (about 921%) more effective at anisotropic filtering than the Radeon R5 M255. (explain)

GeForce GTX Titan X		192000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 173200 (921%)

Pixel Rate

The GeForce GTX Titan X will be quite a bit (about 1177%) more effective at anti-aliasing than the Radeon R5 M255, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX Titan X		96000 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 88480 (1177%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.